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Underwater stereo calibration utilizing virtual object points

 
: Dolereit, Tim; Lukas, Uwe von; Kuijper, Arjan

:

Institute of Electrical and Electronics Engineers -IEEE-; IEEE Oceanic Engineering Society; Marine Technology Society -MTS-:
MTS/IEEE Oceans 2015 : 18-21 May 2015, Genova, Italy
Piscataway, NJ: IEEE, 2015
ISBN: 978-1-4799-8736-8
7 S.
Oceans Conference and Exhibition <16, 2015, Genova>
Englisch
Konferenzbeitrag
Fraunhofer IGD ()
Fraunhofer IGD-R ()
underwater imaging; camera calibration; 3D reconstruction; stereo camera systems

Abstract
For 3D-reconstruction of underwater scenes, a camera calibration handling refractive effects is indispensable. We present a novel geometry-based approach for calibration of stereo-camera-systems in a single underwater housing with a flat interface. Our approach consists of three steps. First, we show a hypothesis on how to relate the location of virtual object points non-ambiguously to the true object location in water. Secondly, axis determination and thirdly, distance determination of a refractive interface towards the cameras is performed with the aid of this hypothesis. We propose, that the calibration can be done with just one stereo-view of a known calibration pattern, that axis determination can be done from stereo correspondences alone and that our hypothesis is a valid constraint for stereo 3d-reconstruction. We evaluated our approach on simulated data with ground truth and real data.

: http://publica.fraunhofer.de/dokumente/N-366742.html